Synthesis and Properties of Copolyimides Derived from Isometric Biphenyltetracarboxylic Dianhydrides (a-BPDA and i-BPDA) and Oxydiphthalic Dianhydride (ODPA) with 4,4’-Oxydianiline (4,4’-ODA)

Abstract

Two series of polyimides were prepared by thermal imidization of polyamide acid derived from 2,3,3’,4’-biphenyltetracarboxylic dianhydride (a-BPDA), 2,3,2’,3’-biphenyltetracarboxylic dianhydride (i-BPDA) or 3,3’,4,4’-oxydiphthalic dianhydride (ODPA) and 4,4’-oxydianiline (4,4’-ODA). The properties of copolyimides derived from a-BPDA and i-BPDA were compared with those of the copolyimides based on a-BPDA and ODPA. The glass transition temperature (T _g) of the former copolyimides increased with an increase of the i-BPDA component, whereas T _g of the later copolyimides decreased with the increase of the ODPA component. The i-BPDA-based copolyimides had higher T _g and better solubility than the a-BPDA homopolyimide, while the ODPA based copolyimides had higher elongation at break. The tensile, dynamic mechanical properties and coefficient of thermal expansion of these copolyimides were characterized.

Keywords

Polyimide solubility isomeric biphenyltetracarboxylic dianhydride dynamic mechanical property

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